| LA Petite Classe Ltd | Education | 2025 |
| Labnotes Limited | Extraterritorial | 2010 |
| Labor of Love Films Ltd | Information & communication | 2012 |
| Laburnum Farm Management Company Limited | Real estate | 2004 |
| Laburnum Real Estate Ltd | Real estate | 2022 |
| Lacy's Cottage Riding School Limited | Arts & recreation | 2006 |
| Ladgate Woods (Middlesbrough) Management Company Limited | Households | 2016 |
| Ladoo Fusion Kitchen Ltd | Hospitality | 2024 |
| Lady Anne Court (Freehold) York Limited | Households | 2020 |
| Lady Anne Court Management Company Limited | Households | 1997 |
| Lady Brigante Limited | Information & communication | 2023 |
| Lady Peckett Ltd | Real estate | 2021 |
| Lady Pecketts Yard Management Company Limited | Households | 2012 |
| Lady's Lane Property Co. Limited | Extraterritorial | 1981 |
| Ladybirds Kinder Class Ltd | Health & social care | 2002 |
| Lagentium Investments Ltd | Real estate | 2023 |
| Lago Insights Limited | Professional & scientific | 2019 |
| Lagom Investments Limited | Extraterritorial | 2017 |
| Laidback Lucas Limited | Professional & scientific | 2015 |
| Lake District Holiday Homes Limited | Hospitality | 2022 |
| Lakedale Whiteley Meadows (North Whiteley) Management Company Limited | Households | 2022 |
| Lakes Jewels Limited | Manufacturing | 2025 |
| Lakes Live Limited | Arts & recreation | 2024 |
| Lakeside Edge (Peterborough) Residents Management Company Limited | Households | 2018 |
| Lakeside Lodges Management Limited | Households | 2003 |
| Lakeside Plumbers Limited | Construction | 1995 |
| Lakin Pubs Ltd | Hospitality | 2025 |
| LAL Quila Restaurants Limited | Hospitality | 2021 |
| Lally Property (York) Ltd | Real estate | 2024 |
| Lalski Limited | Health & social care | 2014 |
| LAM Cleaning Services Limited | Administrative & support | 2026 |
| Lama Properties York Ltd | Real estate | 2018 |
| Lamb & Lamb Ltd | Wholesale & retail | 2023 |
| Lamb Properties Ltd | Real estate | 2025 |
| Lambda Functions Limited | Information & communication | 2012 |
| Lambert Court RTM Company Limited | Households | 2023 |
| Lambert Enterprises Ltd | Transport & logistics | 2019 |
| Lambourn Meadow (Thatcham) Management Company Limited | Households | 2020 |
| Lambs of York Ltd | Administrative & support | 2016 |
| Lamerton Swales Limited | Professional & scientific | 2006 |
| Lanamiche Ltd | Other services | 2004 |
| Lancashire Septics Ltd | Water & waste | 2025 |
| Lancaster Samms Limited | Real estate | 2012 |
| Lancaster Veterinary Centre Limited | Extraterritorial | 2012 |
| Lancrop Laboratories Limited | Extraterritorial | 1980 |
| Land & Development Advisory Limited | Professional & scientific | 2018 |
| Land Care Machinery Ltd | Wholesale & retail | 2021 |
| Land Development Advisory Limited | Professional & scientific | 2021 |
| Land Energy Esco 1 Ltd | Manufacturing | 2011 |
| Land Energy Esco 2 Ltd | Agriculture & fishing | 2012 |
| Land Energy Esco 3 Ltd | Administrative & support | 2012 |
| Land Energy Girvan Limited | Manufacturing | 2009 |
| Land, Property and Capital Limited | Professional & scientific | 2014 |
| Landit Group Ltd | Real estate | 2025 |
| Landlord Broadband & Wireless Technologies Ltd | Information & communication | 2014 |
| Lane END Developments (Yorkshire) Ltd | Construction | 2025 |
| Laneside (Morley) Residents Management Company Limited | Households | 2023 |
| Langburgh Cross Limited | Professional & scientific | 2025 |
| Langdale Holdings Limited | Financial services | 2024 |
| Langdale Thornmere Limited | Real estate | 2025 |
| Langford Bridge (Newton Abbot) Residents Management Company Limited | Households | 2024 |
| Langley House RTM Company Limited | Households | 2019 |
| Langstone Holdings North Limited | Real estate | 2019 |
| Langthorne Hartley Limited | Extraterritorial | 2017 |
| Langthorpe Living Ltd | Hospitality | 2018 |
| Langthorpe Plating Holdings Limited | Financial services | 2021 |
| Langton Capital Ltd | Financial services | 2009 |
| Langton Court (York) Management Company Limited | Households | 2002 |
| Langton Court Freehold Company Limited | Households | 2020 |
| Lankauk Pathways Ltd | Education | 2026 |
| Lanoforte Limited | Agriculture & fishing | 2007 |
| Lansdown Homes Limited | Extraterritorial | 1972 |
| Lantern Heritage Consultancy Ltd | Construction | 2023 |
| Lapare UK Ltd | Water & waste | 2014 |
| Laratech Ltd | Financial services | 2016 |
| Larch Music Ltd. | Wholesale & retail | 2018 |
| Larch Music Tuition Ltd. | Arts & recreation | 2018 |
| Lark Lane Consultancy Ltd | Professional & scientific | 2019 |
| Larkhill Communications Ltd | Professional & scientific | 2021 |
| Larkin Holdings Ltd | Real estate | 2026 |
| Larking’S Ltd | Wholesale & retail | 2020 |
| Larkrise Designs (York) Limited | Manufacturing | 2003 |
| Larkrise Designs UK Ltd | Manufacturing | 2008 |
| Laser Templating Solutions Limited | Professional & scientific | 2025 |
| Last Ditch Limited | Agriculture & fishing | 2019 |
| Last MAN Serving Ltd | Hospitality | 2025 |
| Last Shirt on the Left Ltd | Wholesale & retail | 2014 |
| LAT51 Space Systems Limited | Professional & scientific | 2024 |
| Latch & Lintel Ltd | Real estate | 2025 |
| Laternest Developments Ltd | Construction | 2024 |
| Lathag Medicals UK Limited | Health & social care | 2012 |
| Latitude (Northern) Limited | Construction | 2010 |
| Lauder Mews Crediton Management Company Limited | Households | 2013 |
| Laughing Llama Coffee & Bistro Limited | Hospitality | 2021 |
| Launchbox Technologies Limited | Information & communication | 2025 |
| Launds Field (Galgate) Management Company Limited | Households | 2015 |
| Laura Thackray Communications Ltd | Administrative & support | 2019 |
| Laura Wordsmith Limited | Professional & scientific | 2023 |
| Laureate Heights Sidmouth Management Company Limited | Households | 2011 |
| Laureate Homes Ltd | Real estate | 2020 |